Question

What is the speed (in m/sec) with which a stone is projected vertically upwards from the ground if it attains a maximum height of 3.2 m?

Answer 1

$max. \: height = \frac{ {u}^{2} }{2g}$
$3.2 = \frac{ {u}^{2} }{20}$
u^2 = 64
u= 8 m/s